What’s Vulnerable › Vulnerabilities
CVE-2026-18703: Improper Enforcement of Authentication Mechanism Restrictions in MongoDB Server Allows Use of Disabled Authentication Method
- Severity: medium (CVSS 4.2 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-11 · updated 2026-10-23
- Weakness: CWE-863
Description
An issue in MongoDB Server could allow a party with a valid client certificate and a corresponding user account to authenticate using a certificate-based authentication method, even when an administrator has configured the server to restrict authentication to other mechanisms. This could allow authentication through a method the administrator intended to disable.
Affected products
- MongoDB: from 8.2.0 through 8.2.12; from 8.3.0 before 8.3.8; 9.0.0-alpha0, 9.0.0-alpha1, 9.1.0-alpha0 — fixed in 8.3.8
How to fix
Upgrade to a fixed version: MongoDB 8.3.8. Check the vendor advisory for mitigations.
References
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